This question was created on December 20, 2007 by jdmiles.This question was last modified on December 20, 2007.

ANSWERS AND EXPLANATIONS

A) They have a more anaerobic metabolism compared to the lighter fibers

This answer is incorrect.

Cytochrome C oxidase is a marker of mitochondrial activity. In normal muscle, type 1 fibers stain darker than type 2 fibers with this type of stain.
Type 1 fibers tend to contract more slowly. They are more fatigue resistant, and have a more oxidative metabolism than type 2 fibers.
Type 2 fibers are faster, more easily fatigued, and their metabolism tends to be more anaerobic (glycolytic) compared to type 1 fibers. (See References)

B) They contract more rapidly than the lighter fibers

This answer is incorrect.

Cytochrome C oxidase is a marker of mitochondrial activity. In normal muscle, type 1 fibers stain darker than type 2 fibers with this type of stain.
Type 1 fibers tend to contract more slowly. They are more fatigue resistant, and have a more oxidative metabolism than type 2 fibers.
Type 2 fibers are faster, more easily fatigued, and their metabolism tends to be more anaerobic (glycolytic) compared to type 1 fibers. (See References)

C) There is no functional difference between cells that stain differently

This answer is incorrect.

Cytochrome C oxidase is a marker of mitochondrial activity. In normal muscle, type 1 fibers stain darker than type 2 fibers with this type of stain.
Type 1 fibers tend to contract more slowly. They are more fatigue resistant, and have a more oxidative metabolism than type 2 fibers.
Type 2 fibers are faster, more easily fatigued, and their metabolism tends to be more anaerobic (glycolytic) compared to type 1 fibers. (See References)

D) They are type 2 fibers

This answer is incorrect.

Cytochrome C oxidase is a marker of mitochondrial activity. In normal muscle, type 1 fibers stain darker than type 2 fibers with this type of stain.
Type 1 fibers tend to contract more slowly. They are more fatigue resistant, and have a more oxidative metabolism than type 2 fibers.
Type 2 fibers are faster, more easily fatigued, and their metabolism tends to be more anaerobic (glycolytic) compared to type 1 fibers. (See References)

E) They contract more slowly than the lighter fibers

This answer is correct.

Cytochrome C oxidase is a marker of mitochondrial activity. In normal muscle, type 1 fibers stain darker than type 2 fibers with this type of stain.
Type 1 fibers tend to contract more slowly. They are more fatigue resistant, and have a more oxidative metabolism than type 2 fibers.
Type 2 fibers are faster, more easily fatigued, and their metabolism tends to be more anaerobic (glycolytic) compared to type 1 fibers. (See References)